The Val d'Illiez is a valley in the Canton of Valais, Switzerland. It separates the northern foothills of the Chablais Alps from the Dents du Midi.

Starting from Monthey, the valley splits at Troistorrents:

• Val d'Illiez itself with the villages of Val-d'Illiez and Champéry
• Val de Morgins, between Troistorrents and Morgins

• Troistorrents
• Val-d'Illiez
• Champéry

46°12′N 6°54′E / 46.200°N 6.900°E / 46.200; 6.900